EcoFlow DELTA 2
- usable
- 1,024 Wh
- output
- 1,800 W
- surge
- 2,700 W
- weight
- 12 kg
- recharge
- 72 min
#11 of 14
in the Midsize (1 kWh class) class
Lifted by Trust & reliability and Quiet / livability; held back by charging & solar.
$570 below its $999 list price (57% off)
Check price on AmazonVerdict computed from this model's own tracked price history.
See alternatives to the EcoFlow DELTA 2 →Capacity truth
The watt-hour number on the box isn't what reaches your devices. Rated on the label vs what actually leaves an outlet.
The marketing number — total cell capacity.
~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test) · 13% below the label
Also independently measured
- AC inverter efficiency
- 86–90 %
- Fan noise
- 20–22 dB
- AC charge time
- 80–90 min
- Solar performance
- —
~86-90% (Portable Power Lab measured)
~20-22dB (<50W load) up to ~48-55dB (1000-1800W load) (Portable Power Lab measured); also called "LOUD"/"NOISY" under load by PCWorld and GreenCitizen reviews
OEM manual: 72 min full charge; third-party estimates ~50min to 80% / ~80-90min full (backuppowerhub.com, wattbunker.com) — not OEM-confirmed
2x220W EcoFlow panels ~3-4h full charge in optimal sun; ~5-6h realistic mixed-sun (Backup Power Hub)
Who it fits
Mechanical matches against this model's own sourced specs — never invented sentiment, never a guess on a spec we don't have.
12 kg with 500 W solar input → carry-in, solar-rechargeable
1024 Wh usable → multiple CPAP nights per charge
1800 W inverter, 1024 Wh usable → runs a fridge through an outage
How it scores
Four buyer pillars over seven sub-scores — computed from sourced data with a published formula, price-independent by design.
Power
Usable capacity and how much you can run at once.
Usable watt-hours and how far you can grow it with add-on batteries, versus its size class.
Continuous and surge wattage, outlet count, and USB-C fast-charging.
Trust
Owner reputation, safety record, warranty, and build durability.
Owner ratings, brand reputation, recall record, and warranty backing.
Rated cycle life, warranty length, cell chemistry, and weather sealing.
Charging
Wall and solar recharge speed.
Wall recharge speed, solar input, and multi-source charging.
Livability
Lightweight, portable, and quiet enough to live with.
Weight, footprint, handle, and wheels, versus its size class.
Fan noise under load — quieter is better for bedrooms and CPAP use.
How this score is computed
The BatteryRank score is computed from sourced data with a published formula — ranked by data, not lab testing. Seven sub-scores blend into a 0–100 composite, grouped into four buyer pillars. Price is deliberately not a scoring input: prices move daily, so value intelligence lives in the price section above, judged against this model's own history.
| Pillar | Built from |
|---|---|
| Power | Capacity & expansion + Output & versatility |
| Trust | Trust & reliability + Durability & longevity |
| Charging | Charging & solar |
| Livability | Portability + Quiet / livability |
Scores are cohort-relative — each model is ranked against others in its size class. Missing inputs renormalize out rather than scoring zero (a model is never penalized for a spec nobody in its class publishes), and any figure resting on a documented estimate is tagged est. A full methodology page is coming.
Full specifications
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Hover any figure for its source.
Capacity & battery
- Usable capacity
- 1,024 Wh
- Rated cycle life
- 3,000 cycles
- Battery chemistry
- LiFePO4
- Max capacity with expansion
- 2,048 Wh
- Rated capacity
- 1,024 Wh
- Cycle-life threshold
- 80 %
How much energy you can actually pull out of a full charge — the number that determines real runtime, not a marketing headline figure.
How many full charge-and-drain cycles before the battery drops to its rated threshold (shown alongside — brands rate to different thresholds, so never compare bare cycle counts).
The type of battery cell. LiFePO4 (LFP) cells last far more cycles and are more thermally stable than older lithium-ion (NMC) cells.
The largest total capacity this unit can reach once you add every supported expansion battery.
The battery's nameplate energy capacity — the headline number on the box. Real runtime comes from usable capacity and conversion losses, shown separately.
The remaining-capacity level the cycle rating is measured to. 3,000 cycles to 80% is a stronger battery than 3,000 cycles to 70% — always read the two numbers together.
Power output
- Continuous power output
- 1,800 W
- Surge power output
- 2,700 W
- AC outlets
- 6 outlets
- USB-A ports
- 4 ports
- USB-C ports
- 2 ports
- USB-C max output
- 100 W
- 12V car ports
- 1 ports
- DC barrel ports
- 2 ports
- Max combined output
- 1,800 W
The most power you can draw at once, sustained — this has to be higher than the running wattage of whatever you're plugging in.
A brief power spike the unit can absorb when a device first switches on — matters for things with motors or compressors, like fridges.
How many standard wall-style outlets are built in.
How many USB-A ports are built in, for charging older phones, lights, and accessories.
How many USB-C ports are built in — check the per-port wattage below if you need fast charging for a laptop.
The fastest a single USB-C port can charge a device — relevant for laptops and fast-charging phones.
How many car-socket (cigarette-lighter) style 12V outputs are built in — what CPAPs and car fridges plug into for the most efficient overnight running.
How many round barrel-style DC outputs are built in, used by routers, some lights, and older electronics.
The most power the unit can deliver across ALL ports at the same time — can be lower than the AC rating plus every USB port added up.
Charging & solar
- AC recharge speed
- 1,200 W
- AC charge time (0–100%)
- 72 min
- Max solar input
- 500 W
How fast the unit recharges from a wall outlet — higher means shorter waits between uses.
How long a full recharge takes from a wall outlet, start to finish.
The most solar panel wattage the unit can accept — undersized panels just mean slower charging, not damage, but oversizing this is wasted money.
Reliability & durability
- UPS switchover time
- 30 ms
How fast the unit takes over when grid power cuts out. Under ~20ms is fast enough that most electronics — including many CPAP machines — won't even blip.
Size & portability
- Weight
- 12 kg
How much the unit weighs on its own, without accessories — relevant for portability and carrying it up stairs during an outage.
What reviewers & owners report
Aggregated from named outlets and marketplaces — we own no hardware and never fabricate impressions.
- fast AC charging; strong LFP cycle life/5-yr warranty; wide port selection (15 total ports); reliable after 6mo+ real-world use; solid value in 1kWh class — Amazon reviewers
- fastest-charging in its class at 2022 launch; proven long-running bestseller; expandable to 2048Wh; 5-yr warranty; LFP 3000-cycle; wide port count (15 total); solid build after 6mo+ real use — Across reviewers
- fan noise notably loud under heavy load (PCWorld, GreenCitizen); 1800W base output (2200W X-Boost) limits largest appliances; no native IP rating — Amazon reviewers
- fan noise flagged as loud under heavy load; 1800W base (2200W X-Boost) limits largest appliances; no official IP rating; 500W solar input lower than newer-gen EcoFlow models — Across reviewers
- Popular Mechanics: none
- Wirecutter: none
- widely covered by portable-power YouTube/blog reviewers as a benchmark 1kWh-class pick since its 2022 launch; no single measured consensus captured — YouTube reviewers
Brand reputation: Long-running bestselling SKU since Sept 2022 launch; still a top-selling 1kWh-class unit on Amazon as of 2026 per aggregator trackers; 5-yr warranty; fan noise widely flagged in reviews (PCWorld "LOUD", GreenCitizen "NOISY"). Brand-level: EcoFlow DELTA Max 2000 (EFD310) fire recall 2025-10 — DIFFERENT older/separate product, not DELTA 2
Sources: ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com DELTA 2 User Manual (OEM, accessed 2026-07-10); us.ecoflow.com/products/delta-2-portable-power-station accessed 2026-07-10; amazon.com/dp/B0B9XB57XM accessed 2026-07-10; portablepowerlab.com/ecoflow-delta-2-review (6-month real-use test); backuppowerhub.com/ecoflow-delta-2-review; wattbunker.com/blog/ecoflow-delta-2-specs; storagereview.com/review/ecoflow-delta-2-review; cpsc.gov recall search checked 2026-07-10